That's a great article, Sue. Jennifer, after reading it I'd suggest also sprinkling cinnamon on the soil surface could help prevent the spread of the disease since it spreads from the soil and dead plant tissue through splashing of water onto the leaves.
I'd also now strongly suggest you try the Actinovate biologic fungicide both as a douse and spray. It's fairly new so may have been introduced since that article was written, or may not be considered a "chemical control" since it's a biologic.
Plus, adjust those sprinklers so they only hit the feet of the plant, and mulch over the current area with some fresh, clean mulch. If you can get eucalyptus mulch, it is mildly anti-fungal. Down here we have Florimulch which is made from melaleuca trees, the source of tea tree oil. It is very fungus resistant, and also not hospitable to termites either, which is a huge plus. Don't think you can get Florimulch up there, but if it is available it is The Best. Lowe's carries it here.
